hmm... it seems that for games like this, it's best to play with four players. I completed the previous stage of the World Cup for Heroes 4 in 60 days, and I was also thinking and experimenting with different strategies. Here, I completed it in 73 days according to the table, using only one hero and without any troops...

Added 1 minute ago
Well, that's right, I always forget that when I open a map, I have to close it afterwards...

Added 15 minutes ago
I think in Heroes 4, it's day-week-month... So, 1-4-6 means 27 days, right? It seems strange to me that it can be played much faster...